Gets a "preferred visual" chosen by GdkRGB for rendering image data on the default screen. In previous versions of GDK, this was the only visual GdkRGB could use for rendering. In current versions, it's simply the visual GdkRGB would have chosen as the optimal one in those previous versions. GdkRGB can now render to drawables with any visual.
GdkVisual chosen by GdkRGB. [ transfer none ]
Derived by RGtkGen from GTK+ documentation
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